Traction-pulley.



(No Med al.)

WWW/w Patented Jan. 30, I900. G. LEASK & R. G. DRJNNAN.

TRACTION PULLEY.

{Application filed June 27, 1899.1

2 Sheets-Skeet l GEORGE L IASK AND ROBERT GIFFEN DRINNAN, OF NANAIMO, CANADA.

TRACTIO N PU LLEY.

SPECIFICATION forming part of Letters Patent No. 642,137, dated January 30, 1900.

Application filed June 27,1899. Serial No. 722,060. (No model.)

To all whom it may concern..-

Be it known that we, GEORGE LEAsK and ROBERT GIFFEN DRINNAN, subjects of the Queen of Great Britain, residing at Nanaimo, in the Province of British Columbia and Dominion of Canada, have invented certain new and useful Improvements in Traction-Pulleys; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to improvements in endless-cable pulleys, and more particularly to that class which are employed for railwaycablcs and other systems of endlessrope haulage; and the objects are to simplify and improve the construction and increase the life and efficiency of the pulley and the cable.

To this end the invention consists in the construction, combination, and arrangement of the several parts of the device, as will be here inafter fully described,and particularly poi nted out in the claims.

In the accompanying drawings the same reference characters indicate the same parts of the invention.

Figure 1 is a side elevation of our improved pulley. Fig. 2 is a front elevation of the same. Fig. 3 is a rear or opposite view of the same. Fig. 4 is a cross-section on the diametrical line of the pulley. Fig. 5 is an enlarged detail longitudinal section of the rim. Fig. 6 is a similar transverse view.

In the drawings, 1 denotes the driven shaft, which is mounted in suitable bearings, (not shown,) and 2 denotes the core or hub of the pulley proper and which is keyed to the shaft by the spline or key 3. This hub or center portion of the pulley is provided with a concentric shoulder l, the face of which is parallel with the axis of the pulley, from which shoulder a diagonal face 5 extends outward and terminates in an obtuse-angular concentric shoulder 6, and 7 denotes a separable section, the inner portion of which is formed with bearing-faces 4t, 5, and 6 to correspond to the contiguous faces of the hub-section to form a frictional engagement therewith, the tension of which is regulated by the transverse bolts 8 8, one end of each of which is formed with an angular arm 8,on which is mounted a roller 8 having a bearing on the side of the hub-section, as shown.

9denotes the diagonal face of therim,formed with the parallel guide-flanges 1O 10, and 12 denotes aspiral guide-flange loosely mounted on the diagonal face of the pulley between the flanges and which forms a stationary guide for the cable-coils around the pulley. One side of this spiral guide is provided with a series of recesses or pockets 12, in each of which is secured a follower-block 12 removably secured to the guide by the bolts 13 13, and ll denotes a bearing-ball loosely mountcd in each pocket, so that a portion of its periphery projects beyond the contiguous face of the guide and forms a rolling bearing for the traveling cable. This spiral guide is placed on the separable section in such position that one end begins at the point where the incoming cable meets or first touches the pulley at a point on its smaller diameter, and after the guide and cable pass in parallel lines two or more times around the separable section the other end of the guide stops on the larger diameter of the pulley at the point where the cable leaves the separable section. This arrangement prevents the slipping or fleeting of the cable on the pulley and, owing.

to the inclined face of the pulley and the fact that the cable goes on the smaller and leaves on the larger diameter, causesit to be crowded laterally across and u p the inclined face,theroby hugging the pulley more snugly, and as this operation increases the degree of friction between the coils and the pulley a less number of coils are required to transmit a given power.

It will of course be understood that various changes in the form, proportion,and the minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of this invention.

Having thus described the invention, what is claimed, and desired to be secured by Letters Patent, is

1. A traction-pulley comprising a shaft, a pulley-hub fixed to said shaft, and a pulleyrim having a frictional engagement with said hub, substantially as and for the purpose set forth.

2. A traction-pulley comprising a shaft, 21. pulley-hub fixed on said shaft, a separable section having a frictional engagement with said hub, and means for regulating the traction between the hub and section, substantially as and for the purpose set forth.

3. A traction-pulley having its plane face arranged diagonal to its axis, and a spiral guide encompassing the face of said pulley, substantially as and for the purpose set forth.

4. Atraction-pulleyhavingadiagonal face, a spiral guide encompassing said face, and a series of bearingrollers mounted in said guide, substantially as and for the purpose set forth. 

